You can buy the native coins of Electra Protocol (XEP) on a number of exchanges. The amount of exchanges is still limited, as Electra Protocol was officially launched just in January 2021. Since Electra Protocol is running on its own blockchain, exchanges have to manually connect to this new network, which takes time.
As of today, you cannot buy XEP yet on any top 10 exchange like Coinbase, Kraken, or Binance. More exchange listings are planned to happen. Finding the right exchange for your country of residence can be challenging for new investors, since not all exchanges are open to residents of every country. Depending on the crypto exchange, you might also have to identify yourself in a KYC process (where you have to identify yourself by submitting your ID and a proof of address).